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Pulmonary Mycobacterium avium complex infection — Clinical Guidelines

Overview

Pulmonary Mycobacterium avium complex (MAC) infection is an opportunistic mycobacterial disease affecting primarily the lungs, often seen in immunocompromised individuals but also occurring in immunocompetent patients. It typically presents with chronic respiratory symptoms and can be challenging to diagnose and treat due to its slow growth and variable clinical course 2.

Diagnosis

Clinical Presentation: Chronic cough, sputum production, and respiratory symptoms lasting more than two years 2.

Microbiological Confirmation: Positive culture from respiratory samples, though not all positive cultures indicate active disease (30% vs. 50% estimated by experts vs. nonexperts) 2.

Imaging: Chest imaging often shows nodular or cavitary lesions, but these findings are not specific 2.

Species Identification: Essential for guiding treatment; use of specific antisera aids in rapid identification within the MAC complex 9.

Management

First-Line Treatment: Combination therapy typically includes clarithromycin, rifampin, and ethambutol for 18 months or longer 2.

Adjunctive Therapies: Adjustments in regimen based on recurrence (less-intensive regimens for 10% of patients post-recurrence) 2.

Monitoring for Adverse Effects: Regular monitoring for drug-induced complications, such as rifabutin-induced cystoid macular edema 3.

Special Populations

Immunocompetent Patients: Treatment approaches similar to immunocompromised but may require longer observation periods for spontaneous remission 2.

Comorbidities: No specific guidelines provided in abstracts; management should consider individual comorbidities and potential drug interactions 2.

Key Recommendations

Diagnosis Requires Positive Culture with Clinical Correlation: Positive cultures should be interpreted cautiously, considering clinical context and expert opinion (Evidence: Expert opinion) 2.

Combination Therapy for at Least 18 Months: Use of clarithromycin, rifampin, and ethambutol as first-line therapy for a prolonged duration (Evidence: Expert opinion) 2.

Adjust Treatment Based on Recurrence: Consider less-intensive regimens in patients with recurrent disease (Evidence: Expert opinion) 2.

Monitor for Drug-Induced Complications: Regular follow-up to detect adverse effects like rifabutin-induced ocular complications (Evidence: Weak) 3.

References

1 Klotz D, Barth SA, Baumgärtner W, Hewicker-Trautwein M. Mycobacterium avium subsp. hominissuis Infection in a Domestic Rabbit, Germany. Emerging infectious diseases 2018. link 2 Marras TK, Prevots DR, Jamieson FB, Winthrop KL. Opinions differ by expertise in Mycobacterium avium complex disease. Annals of the American Thoracic Society 2014. link 3 Vaudaux JD, Guex-Crosier Y. Rifabutin-induced cystoid macular oedema. The Journal of antimicrobial chemotherapy 2002. link 4 Woods GL, Witebsky FG. Susceptibility testing of Mycobacterium avium complex in clinical laboratories. Results of a questionnaire and proficiency test performance by participants in the College of American Pathologists Mycobacteriology E Survey. Archives of pathology & laboratory medicine 1996. link 5 Quinn SF, Demlow TA. Large-caliber (24-28-F) catheters for radiologically guided percutaneous procedures. Radiology 1993. link 6 Roberts C, Clague H, Jenkins PA. Pulmonary infection with Mycobacterium malmoense: a report of 4 cases. Tubercle 1985. link90038-8) 7 Medinger AE, Spagnolo SV. Mycobacterium szulgai pulmonary infection: the importance of knowing. Southern medical journal 1981. link 8 Matthews PR, McDiarmid A. Mycobacterium avium infection in freeliving hedgehogs (Erinaceus europaeus L). Research in veterinary science 1977. link 9 Gales PW, Martins RR, Walker WE. Production of multivalent fluorescent antisera for identification of organisms in the Mycobacterium avium-Mycobacterium intracellulare complex. Applied microbiology 1974. link

Pulmonary Mycobacterium avium complex infection